The number of Kickstarters is the sum of number of successful and currently running Kickstarters in the top ten cities in each state, plus the state capital, taken from Kickstarter
The populations are in millions and are taken from the 2010 data on Wikipedia.
The Gross State Product is from 2010 data and is taken from Wikipedia.
The Ewing Marion Kauffman Foundation releases a yearly summary of entrepeneurship on a state by state basis. The Entrepeneurship index is defined as the percent of individuals (ages 20-64) who do not own a business in the first survey month that start a business in the following month with 15 or more hours worked. The data can be downloaded from here.